Electric heater.



No. 744,974. PATENTED Nov. 24, 1903. J. E. MGELEOY. ELECTRIC HEATER.

APPLIOATION FILED MAY 1, 1903.

N0 MODEL.

s NoRms Penas co, Pno'rauwo, WASHINGTON n c UNITED STATES Aatented November 24, 1903.

PATENT OFFICE.

JAMES F. MCELROY, OF ALBANY, NEWY YORK, ASSIGNOR TO CONSOLIDATED OAR HEATING COMPANY, OF ALBANY, NEIN YORK, A CORPORATION OF WEST VIRGINIA.

LEOTElO EIATER.

SPECIFICATION forming part of Letters atent No. 744,974, dated November 24, 1903.

Application filed May 1,1908. Serial No. 155.155. (No model.)

T @ZZ whom t may concern,.-

Be it known that I, JAMEs F. MCELEOY, a citizen cf the United States, residing at Albany, county of Albany, and State of New York, have invented certain new and useful Improvements in Electric Heaters, of which the following specification and its accompanying drawings set forth, as an illustration, that form of the invention which I now conto sider the best ont of the various forms in which the principles of the invention may be embodied.

In the drawings, Figure l is avertical longitudinal section of a heater embodying my invention, and Fig. 2 is a transverse section thereof.

In electric heaters having the heatingsconductors wound in a progressive form from one end of the structure to the other it is zo often important that the wire be brought back to the starting-point after the winding is completed, so that both terminals may be at the same end of the heater. This has usually been done by extending the wire haelt z5 from the finishing to the starting end in a route external to the winding, thus exposing the wire and necessitating the employment of means for insulating and supporting it.

In my present arrangement I employ a por- 3o celain core for receiving the winding, which, in the usual manner, is perforated from end to end by au opening,through which is passed a rod for upholding and retaining the core and winding. In addition I provide a second and\separate perforation through the core parallel to the said rod, and through it I pass the return-wire from the finishing to the starting end of the winding. This return-wire thus comes inside of the winding 4o and is protected and insulated by the porcelain of the core, while the heater is of neater appearance, is more convenient, and safer, being free from the straggling external return-Wire that would otherwise be required.

In the example shown in the drawings, A represents the external casing, which may be of any suitable form.

B is the porcelain core, having on its exterior a spiral groove in which is laid the spi- 5o rally-composed heating-coil O, this being in accordance with the construction now well known to the art in heaters of my design. In the core B there is a square hole or passage from end to end, located, in the present arrangement, somewhat eccentrically, and through this hole passes the square rod D, that holds in place the end pieces K K and also serves as a support or retaining device for the core and coil within the casing. Parallel to the square hole aforesaid I extend a 6o small round hole E through the core, also eccentric thereto,`and through this hole is passed the return-wire F, leading from the left-hand end of the core, where the winding is finished, back to the right-hand end, where the winding is started. By this means both terminals of the winding are brought to the same end of the core and maybe there disposed for ready construction with the external circuit in any known manner. Thereturn-wire 7o F may be insulated, or it maybe left bare and the porcelain core relied upon for its insulation from the winding.

TWhat I claim as new, and desire to secure by Letters Patent, is-

l. A heater-core perforated longitudinally with two parallel and separate passages one for the retaining-rod and the other for the return-wire ofy the winding.

2. A heater-core perforated longitudinally 8o with two parallel and separate passages, and a winding thereon extending from end to end of the core and having its return-wire passed through one of the said passages, the other passage inclosing a retaining-rod. 8

3. A heater-core having two parallel and eccentric passages extending longitudinally through it from end to end, one for the retaining-rod andthe other for the return-wire of the winding'. 9o

4. An electric heater having a winding surrounding a core perforated longitudinally by two separate passages, a retaining-rod in one of said passages and a return-wire for the winding in the other passage.

In witness whereof I have hereunto set my hand, before two subscribing witnesses, this 28th day of April, 1903.

JAMES E. MCELROY.

IVitnesses:

BEULni-T CABLE, ERNEST D. JANSEN. 

